Fig. 1.

Genetic divergence across 196 rhizobium strains. Pairwise comparisons of genetic diversity were analysed at different levels. (a) Proportion of shared SNPs in genes that were present in at least 100 strains and that passed filtering criteria (6529 genes, 441 287 SNPs). Clusters of strains with SNP identity above 96 % were recognized as five genospecies: gsA (blue), gsB (salmon), gsC (green), gsD (purple), gsE (pink) as indicated in the legend. (b) Average nucleotide identity for concatenated sequences of 305 housekeeping genes. (c) Number of shared genes. Strain origins are indicated by coloured bars at the left (DKO in red, DK in purple, F in yellow, and the UK in green). Strains were ordered by clustering of the SNP data.